Rotary slide holder for projectors



Feb. 7, 1939. 3, $P|NDLER 2,146,452

ROTARY SLIDE HOLDER FOR PROJECTORS Filed Jan. 5, 1938 5 Sheets-Shee 1 EIE.1,

IN V EN TOR. r3 UETH 1! 5332mm I ATTORNEY Feb. 7, 1939. j G. SPINDLIER 2,146,452

ROTARY SLIDE HOLDER FOR PROJECTORS Filed Jan, 5, 1938 5 Sheets-Sheet 2 llllllllul llll E 42 ,59 1p 64 29' 3 43 E 57 E v 3/ in 62 O ii IN V EN TOR.

G UETEV EPJHDLBH A ORNEY.

Feb. 7, 1939. G SPINDLER v Q ROTARY SLIDE HOLDER FOR PROJECTQRS Filed Jan. s, 1938 5 Sheets-Sheet s 'ELEDEW ATTORNEY Feb. 7, 1939.

G. SPINDLER I ROTARY SLIDE HOLDER FOR PROJ ECTORS Filed Jan. s, 1938 5 Sheets-Sheet 4 INVEN'TOR. GUSIAV INDLER;

c? \Qw ATTORNEY Feb. 7, 1939. G. SPINDLER ROTARY SLIDE HOLDER FOR PROJECTORS 5 Sheets-Sheet 5 Filed Jan. 3, 1938 IP23 w @335) 3 INVENTOR.

E US TAY SPINDLER BY 8 M ATTORNEYS.

shim xswukmt Patented Feb. 7, 1939 2,146,452 301mm; SLIDE, HOLDER: a PaoJE o'roas Gustav Spindler, San Francisco, C alif assignor =t'o*Spindler' & Sauppe, a=corporation of Cali? fornia Application January 3,

4 Claims.

This invention relates toimprovements in projectois' and has particular reference to a projector wherein the slides to be thrown upon the screen are automatically moved into and out of the beamof light at predetermined intervals, or, iff'desired, manually actuatedirom a revolving magazine.

' The principal object of this invention is to pro-- duce 'a device of this character which may be attached to a standard projector, thus eliminating expensive changes to the projector.

A further object is to produce a'device of this character which is simple in construction, economical to manufacture, and one which will not require attention over long periods of time.

""Aiurther object is to provide means whereby the magazine maybe readily and quickly changed of this specification and in which like numerals 1, from above;

mounting;-

are employed to designate like parts throughout the-same,

Fig; lis a front elevation of my device, showingthe same attached to a standard projector; Fig; 2 is a top plan view of Fig. 1, showing portions" thereof broken away;

"-Fig. 3'is an enlarged fragmentary cross sectional view of my device, showing portions'there ofin elevation;

Fig. 4 is a bottom plan view of the base plate with the motor removed and showing the parts in retracted position;

l Fi'g.-5*is a fragmentary detailed view, showing the magazine gear lock Fig. 6 is a fragmentary detailed view similar to Fig. 4 and showing the slide actuated mechanismin advanced position;

Fig. '7 is a side elevation of the slide carrier Fig. 8 is a top plan view of Fig. '7; and

Fig. 9 is a diagrammatic view of the wiring.

In projecting pictures upon a screen, or other receiving surface, it is customary to place a transparency within a beam of light whereby t h'e'beam projects the picture upon a receiving surface. Then it is necessary to remove this picture and insert another in the carrier, which 'is again moved before the beam of light. With this mechanism as viewed 7 a e i N9: .2197! (C1. 88-27) type of mechanism, the operator must coordinate his efforts'with a lecturer, if a lecture is being given and'illustrated by the pictures. Further, mares a visible movement 'on the screenduring thechanging'of the slides.

I have, therefore, devised a mechanism wherein actualit of slides are maintained in a magazine whichmay be readily placed 'upon an actuating mechanism, after which the slides will be introduced intothe projector at various intervals; anddu'ring this period of injection and removal, the" light in'the pro'j'ector will be extinguished and relit so that there is no apparent movement visible on "the'screen' Inorder to accomplish this object, I provide a bracket 5which is attached to the projector, des ignated as awhole by the numeral 6, through the medium of thumb screws 1'. bracket" 5 is a casing 8 further supported by an adjustment screw 9." Mounted upon the casing 8 is "ab'ase plate i l which is held to the base by an annular ring 12 and screwslii. It will here be *noted that'this ring I2 ,has an extension 14, the purpose of which will be laterseen. Rotatably mounted on theplate ll is-a magazine gear ring-l6 which has a projection l1 underlapping theex't'en'sion it, thus holding the ring IS on the base H andan upstanding pin I8 capable of en'- tering'the'hole I9 formed in the magazine base 2l.-- The plate lihas an upstanding collar 22 whichis engaged by the hooked ends 23 of the with an intermittently operated gear 31 mounted en ashait 38,-which extends through the plate I I} and is provided with a single tooth 33 adapted toe ngage the teeth 34 of the gearring H3. A crank arm 39 is-connected to the gear 31 at one end and is pivoted a short distance from its opposite'end as at 4| to a toothed segment 42, pivoted as at 43 to the underside of'the plate ill. The intermittent gear 31 carries a locking segment 44 which is adapted to contact a complementary? locking segment 46 formed upon Secured to the 53, the purpose or" which will be later seen. block 49 carries a slide carrier 54 having a finger adaptd to engage the hooked ends 23 in the same trated at i iin Fig. 9.

the gear 36. The cutaway portion 41 of the gear 36 permits this gear to keep on rotating during the still period of the gear 37, or during that period when the member M is riding upon the member 46. In other words, this movement is in reality a modified Geneva movement. The segment 52 meshes with a rack d8 carried upon the underside of the slide carrier block 49 which with the block 55 moves in tracks 52 carried on the undersurface of the plate ii. These slide carrier blocks are secured together by a spring The manner described in my patent, No. 2,076,924.. It is understood that the slide carrier 5% extends through a slot in the plate H. The gear 31 carries a cam 56 which is contacted by an arm 5! attached to a pivoted carrier 58 mounted upon a support 59. This carrier 58 supports a mercury switch iii, whereby when the arm 51 rides upon the cam 55, it will tip the mercury switch and break an electrical circuit. A similar mercury switch 52 has an arm 83 which is adapted to engage a cam 6% formed upon the gear 36. This mercury switch 52 also controls an electrical circuit through a timer mechanism 58. A switch lever ti operates connections to control the time interval that the slides are viewed.

In order to lock the magazine against accidental rotation so that it will not be jarred out of registration with the opening in the projector into which the slide must move, I provide a magazine gear lock mechanism which consists of a peculiarly shaped lever 88, pivoted to the underside of the plate ii and engaged by a pin 69 carried upon the free end of the crank arm 39. This pin 69 causes the lever 58 to move from the full line position to the dotted line position of Fig. 5 when the parts move from that shown in Fig. 4 to that shown in Fig. 6. As a result, a pin H (see Fig. 2) is moved into and out of the teeth 34 at each reciprocation of the crank arm 39. In order to prevent movement of the lever 68, except when it is in the position of Fig, 4, I provide segmental tracks 72 on the underside of the segment .2, which tracks are in spaced arcuate alignment with a pin I3 projecting downwardly from the lever 58. Therefore, when the parts are in the position of Fig. 4, the pin 68 will cam upon the surface A (see Fig. 5) and push the lever 68 in such a direction as to remove the pin ll from the tooth of the gear 116, so that the gear 16 may be moved one notch to bring a new slide into proper alignment. As soon as the pin 69 has left the cam surface A, the pin it will again be in proper position to'be engaged by the tracks 72, and, therefore, the pin H will be held locked in the teeth 3%.

The result of this construction is that when the machine is assembled as shown and it is desired to project pictures upon a screen, the operator closes the switch, diagrammatically illus- As a result, current is delivered from the line to the motor 283, which motor drives the gear 35 and its attached gear 36. At the beginning of the cycle the parts will be in the position of Fig. l. Consequently, the rotation of the gear 36 will cause rotation of the gear 31, movement or the crank arm 39, movement of the segment 52, rack 53, slide carrier blocks t9 and 5!, and the slide carrier 54. As the slide carrier moves forwardly, a slide is moved into the projector. At the same time, as the segment 42 moves from the position of Fig. 4 to that of Fig. 6, the tracks on the underside of the segment d2 will move over the pin 13 of the lever 58, thus locking this lever 68 against pivotal movement, with the result that the pin H, projecting through the plate II, will be held in the teeth 34 of the gear ring It, and the magazine, which is resting upon this gear ring it and pinned thereto, will be held against any possible misalignment. As soon as a slide has reached the position within the projector, the mercury switch 62, which is a double pole switch, is actuated by the arm 53 being engaged by the cam 64, and the bulb in the projector is illuminated. At the same time, the motor 28 is cut out, leaving all parts at rest. However, there will be a slight inertia to the motor, and, therefore, by mutilating the gear 36, this continued movement of the motor will not effect movement of the gear 31. The timer mechanism 66, however, is operating and finally completes a circuit through brushes B, (see Fig. 3) wherein power is again switched on to again start the motor. As the gear 36 and its attached gear 3! are rotated further, the arm 63 will move off the cam 64, and the light will be extinguished. The motor will continue to func tion until the locking member 44 leaves the complementary locking segment 46 and the teeth of the gears 37 and 36 again mesh, resulting in the gear 3'5 through the crank arm 39 returning the segment 42 to its starting position. It may be here explained that when the slide carrier 54 reaches its innermost position, the slide carrier block 39 is stopped, and the slide carrier block 5!, to which the rack 38 is attached, continues a short distance, which is permitted through the action or" the spring 53. It is during the short interval that the slide carrier block 5! parts from the slide carrier block 49 that the magazine is moved, sufliciently to bring a new slide into position, and this is accomplished by the tooth 33, carried uponv the shaft 38 to which the gear 37 is attached, engaging one of the teeth in the gear I6 upon. which the magazine is resting. Also, at this time,

the pin 69 moves the lever 68 so as to move the pin 7i into the position of Fig. 2, thus unlocking the gear it so that it may be moved the required.

distance. This completes one'cycle of operation. However, should a person turn on" the switch 14.

during the time that a slide is in the projector,.

the mercury switch 6| will be in such a position as to hold the current on the motor and timer mechanism to complete the cycle of operation, which will be completed when the arm 51 rides upon the cam 56, thus moving the mercury switch 6! to off,

position.

It is to be understood that the form of my invention herewith shown and described is to be; taken as a preferred example of the same and. that various changes relative to the material, size,,

rotatable slide magazine detachably mounted on said ring gear and said base plate, driving pins secured on said ring gear and extending upwardly into holes in said magazine to form a driving connection for said magazine when said ring gear is rotated, a one-toothed gear and driving means for rotating said ring gear in steps of one tooth at a time, and driving means including intermittent gears and cams for intermittently moving said ring gear and said magazine to successive positions and for moving slides into and out of projecting position.

2. In a device of the character described, the combination of a projector, a casing structurally related thereto, a longitudinally disposed base plate on said casing, a ring gear on said base plate, a rotatable slide magazine detachably mounted on said ring gear and said base plate, driving means connecting said ring gear and said magazine, whereby said magazine and said ring gear will be simultaneously moved, a slide carrier for moving slides from said magazine into projecting position and withdrawing said slides into said magazine, slide carrier blocks on said base plate and supporting said carrier, a rack connected to one of said slide carrier blocks, spring means for connecting said blocks one to the other, a toothed segment engaging said rack, cam means for intermittently moving said segment, and a locking pin intermittently engaging v the teeth of said ring gear during projection.

3. In a device of the character described, the

* combination of a projector, a casing structurally related thereto, a base plate, an annular ring gear on said base plate, a magazine removably positioned on said base plate, a locking pin lever pivotally mounted beneath said base plate and having a pin extending therethrough, whereby said pin may enter the teeth of said ring gear,

an intermittently actuated crank engaging said lever to move said pin into and out of the teeth of said ring gear, a slide moving means structurally in cooperation with said magazine and comprising a slide carrier mounted on said base plate, a segment mounted on said plate and having driving connection with said carrier and said crank, and driving means for intermittently actuating said crank.

4. In a device of the character described, the combination of a projector, a casing structurally related thereto, a base plate, an annular ring gear on said base plate, a magazine removably positioned on said base plate, a locking pin lever pivotally mounted beneath said base plate and having a pin extending therethrough, whereby said pin may enter the teeth of said ring gear, an intermittently actuated crank engaging said lever to move said pin into and out of the teeth of said ring gear, a slide moving means structurally in cooperation with said magazine and comprising a slide carrier mounted on said base plate, a segment mounted on said plate and having driving connection with said carrier and said crank, driving means for intermittently actuating said crank, and arcuate tracks carried by said segment and engaging a pin on said lever, whereby said lever will be locked against movement during the reciprocation of said segment.

GUSTAV SPINDLER. 

